# Lesson 13

Día 2 de centros (optional)

### Narrative

The purpose of this True or False is to elicit strategies and understandings students have for adding with multiples of 2 and 2 equal addends. These understandings help students deepen their understanding of the properties of operations, fluency within 20, and will be helpful practice as students develop foundations for multiplication.

### Launch

• Display one statement.
• “Hagan una señal cuando sepan si la afirmación es verdadera o no, y puedan explicar cómo lo saben” // “Give me a signal when you know whether the statement is true and can explain how you know.”
• 1 minute: quiet think time

### Activity

• Share and record answers and strategy.
• Repeat with each statement.

### Student Facing

Decide si cada afirmación es verdadera o falsa. Prepárate para explicar tu razonamiento.

• $$2 + 2 + 2 + 2 = 4 + 4$$
• $$2 + 2 + 2 = 3 + 3$$
• $$2 + 2 + 2 + 2 + 2 + 2 = 5 + 5$$

### Activity Synthesis

• “¿Cómo pueden explicar su respuesta sin encontrar el valor de ambos lados?” // “How can you explain your answer without finding the value of both sides?”

## Activity 1: Centros: Momento de escoger (40 minutes)

### Narrative

The purpose of this activity is for students to have another chance to practice skip-counting by 2, 5, and 10 and addition and subtraction within 1,000.

### Required Materials

Materials to Gather

### Required Preparation

Gather materials from:

• Write Numbers, Stage 4
• Target Numbers, Stages 6 and 7
• Five in a Row, Stages 7 and 8
• How Close, Stage 4

### Launch

• “Ahora van a escoger centros de los que ya conocemos” // “Now you will choose from centers we have already learned.”
• Display the center choices in the student book.
• “Piensen qué les gustaría hacer primero” // “Think about what you would like to do first.”
• 30 seconds: quiet think time

### Activity

• Invite students to work at the center of their choice.
• 1520 minutes: center work time
• “Escojan qué les gustaría hacer ahora” // “Choose what you would like to do next.”
• 1520 minutes: center work time
• If time allows, have students choose a third center to work on.

### Student Facing

Escoge un centro.

Escribe números

Números objetivo

Cinco en línea

¿Qué tan cerca?

### Activity Synthesis

• Invite 2-3 students to share their favorite method for adding and subtracting within 1,000.

## Lesson Synthesis

### Lesson Synthesis

“Este año hemos aprendido mucho sobre la suma y la resta. ¿Cuáles son algunas cosas importantes que debemos recordar sobre la suma y la resta?” // “We have learned a lot about addition and subtraction this year. What are some important things we need to remember about addition and subtraction?”

Share and record responses.

“¿Qué preguntas tienen sobre la suma y la resta?” // “What questions do you have about addition and subtraction?”